mirror of
https://github.com/miniflux/v2.git
synced 2025-07-02 16:38:37 +00:00
refactor: simplify Youtube feeds discovery
This commit is contained in:
Frédéric Guillot
parent
cb97d4a1a8
commit
36c25e7689
2 changed files with 199 additions and 155 deletions
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@ -5,7 +5,6 @@ package subscription // import "miniflux.app/v2/internal/reader/subscription"
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"log/slog"
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@ -25,18 +24,9 @@ import (
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"golang.org/x/net/html/charset"
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)
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type youtubeKind string
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const (
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youtubeIDKindChannel youtubeKind = "channel"
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youtubeIDKindPlaylist youtubeKind = "playlist"
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)
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var (
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youtubeHostRegex = regexp.MustCompile(`youtube\.com$`)
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youtubeChannelRegex = regexp.MustCompile(`channel/(.*)$`)
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errNotYoutubeUrl = fmt.Errorf("this website is not a YouTube page")
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)
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type SubscriptionFinder struct {
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@ -80,77 +70,58 @@ func (f *SubscriptionFinder) FindSubscriptions(websiteURL, rssBridgeURL string)
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LastModified: responseHandler.LastModified(),
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}
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// Step 1) Check if the website URL is a feed.
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// Step 1) Check if the website URL is already a feed.
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if feedFormat, _ := parser.DetectFeedFormat(f.feedResponseInfo.Content); feedFormat != parser.FormatUnknown {
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f.feedDownloaded = true
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return Subscriptions{NewSubscription(responseHandler.EffectiveURL(), responseHandler.EffectiveURL(), feedFormat)}, nil
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}
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var subscriptions Subscriptions
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// Step 2) Parse URL to find feeds from YouTube.
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kind, _, err := youtubeURLIDExtractor(websiteURL)
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slog.Debug("YouTube URL ID extraction", slog.String("website_url", websiteURL), slog.Any("kind", kind), slog.Any("err", err))
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// If YouTube url has been detected, return the YouTube feed
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if err == nil || !errors.Is(err, errNotYoutubeUrl) {
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switch kind {
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case youtubeIDKindChannel:
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slog.Debug("Try to detect feeds from YouTube channel page", slog.String("website_url", websiteURL))
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subscriptions, localizedError = f.FindSubscriptionsFromYouTubeChannelPage(websiteURL)
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if localizedError != nil {
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return nil, localizedError
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}
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case youtubeIDKindPlaylist:
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slog.Debug("Try to detect feeds from YouTube playlist page", slog.String("website_url", websiteURL))
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subscriptions, localizedError = f.FindSubscriptionsFromYouTubePlaylistPage(websiteURL)
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if localizedError != nil {
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return nil, localizedError
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}
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}
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if len(subscriptions) > 0 {
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slog.Debug("Subscriptions found from YouTube page", slog.String("website_url", websiteURL), slog.Any("subscriptions", subscriptions))
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return subscriptions, nil
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}
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// Step 2) Check if the website URL is a YouTube channel.
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slog.Debug("Try to detect feeds from YouTube channel page", slog.String("website_url", websiteURL))
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if subscriptions, localizedError := f.FindSubscriptionsFromYouTubeChannelPage(websiteURL); localizedError != nil {
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return nil, localizedError
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} else if len(subscriptions) > 0 {
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slog.Debug("Subscriptions found from YouTube channel page", slog.String("website_url", websiteURL), slog.Any("subscriptions", subscriptions))
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return subscriptions, nil
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}
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// Step 3) Parse web page to find feeds from HTML meta tags.
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// Step 3) Check if the website URL is a YouTube playlist.
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slog.Debug("Try to detect feeds from YouTube playlist page", slog.String("website_url", websiteURL))
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if subscriptions, localizedError := f.FindSubscriptionsFromYouTubePlaylistPage(websiteURL); localizedError != nil {
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return nil, localizedError
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} else if len(subscriptions) > 0 {
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slog.Debug("Subscriptions found from YouTube playlist page", slog.String("website_url", websiteURL), slog.Any("subscriptions", subscriptions))
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return subscriptions, nil
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}
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// Step 4) Parse web page to find feeds from HTML meta tags.
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slog.Debug("Try to detect feeds from HTML meta tags",
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slog.String("website_url", websiteURL),
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slog.String("content_type", responseHandler.ContentType()),
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)
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subscriptions, localizedError = f.FindSubscriptionsFromWebPage(websiteURL, responseHandler.ContentType(), bytes.NewReader(responseBody))
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if localizedError != nil {
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if subscriptions, localizedError := f.FindSubscriptionsFromWebPage(websiteURL, responseHandler.ContentType(), bytes.NewReader(responseBody)); localizedError != nil {
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return nil, localizedError
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}
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if len(subscriptions) > 0 {
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} else if len(subscriptions) > 0 {
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slog.Debug("Subscriptions found from web page", slog.String("website_url", websiteURL), slog.Any("subscriptions", subscriptions))
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return subscriptions, nil
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}
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// Step 4) Check if the website URL can use RSS-Bridge.
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// Step 5) Check if the website URL can use RSS-Bridge.
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if rssBridgeURL != "" {
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slog.Debug("Try to detect feeds with RSS-Bridge", slog.String("website_url", websiteURL))
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subscriptions, localizedError := f.FindSubscriptionsFromRSSBridge(websiteURL, rssBridgeURL)
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if localizedError != nil {
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if subscriptions, localizedError := f.FindSubscriptionsFromRSSBridge(websiteURL, rssBridgeURL); localizedError != nil {
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return nil, localizedError
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}
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if len(subscriptions) > 0 {
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} else if len(subscriptions) > 0 {
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slog.Debug("Subscriptions found from RSS-Bridge", slog.String("website_url", websiteURL), slog.Any("subscriptions", subscriptions))
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return subscriptions, nil
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}
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}
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// Step 5) Check if the website has a known feed URL.
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// Step 6) Check if the website has a known feed URL.
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slog.Debug("Try to detect feeds from well-known URLs", slog.String("website_url", websiteURL))
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subscriptions, localizedError = f.FindSubscriptionsFromWellKnownURLs(websiteURL)
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if localizedError != nil {
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if subscriptions, localizedError := f.FindSubscriptionsFromWellKnownURLs(websiteURL); localizedError != nil {
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return nil, localizedError
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}
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if len(subscriptions) > 0 {
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} else if len(subscriptions) > 0 {
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slog.Debug("Subscriptions found with well-known URLs", slog.String("website_url", websiteURL), slog.Any("subscriptions", subscriptions))
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return subscriptions, nil
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}
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@ -301,57 +272,40 @@ func (f *SubscriptionFinder) FindSubscriptionsFromRSSBridge(websiteURL, rssBridg
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}
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func (f *SubscriptionFinder) FindSubscriptionsFromYouTubeChannelPage(websiteURL string) (Subscriptions, *locale.LocalizedErrorWrapper) {
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kind, id, _ := youtubeURLIDExtractor(websiteURL)
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decodedUrl, err := url.Parse(websiteURL)
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if err != nil {
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return nil, locale.NewLocalizedErrorWrapper(err, "error.invalid_site_url", err)
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}
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if kind == youtubeIDKindChannel {
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feedURL := fmt.Sprintf(`https://www.youtube.com/feeds/videos.xml?channel_id=%s`, id)
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if !youtubeHostRegex.MatchString(decodedUrl.Host) {
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slog.Debug("This website is not a YouTube page, the regex doesn't match", slog.String("website_url", websiteURL))
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return nil, nil
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}
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if matches := youtubeChannelRegex.FindStringSubmatch(decodedUrl.Path); len(matches) == 2 {
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feedURL := fmt.Sprintf(`https://www.youtube.com/feeds/videos.xml?channel_id=%s`, matches[1])
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return Subscriptions{NewSubscription(websiteURL, feedURL, parser.FormatAtom)}, nil
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}
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slog.Debug("This website is not a YouTube channel page, the regex doesn't match", slog.String("website_url", websiteURL))
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return nil, nil
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}
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func (f *SubscriptionFinder) FindSubscriptionsFromYouTubePlaylistPage(websiteURL string) (Subscriptions, *locale.LocalizedErrorWrapper) {
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kind, id, _ := youtubeURLIDExtractor(websiteURL)
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if kind == youtubeIDKindPlaylist {
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feedURL := fmt.Sprintf(`https://www.youtube.com/feeds/videos.xml?playlist_id=%s`, id)
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return Subscriptions{NewSubscription(websiteURL, feedURL, parser.FormatAtom)}, nil
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}
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slog.Debug("This website is not a YouTube playlist page, the regex doesn't match", slog.String("website_url", websiteURL))
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return nil, nil
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}
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func youtubeURLIDExtractor(websiteURL string) (idKind youtubeKind, id string, err error) {
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decodedUrl, err := url.Parse(websiteURL)
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if err != nil {
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return
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return nil, locale.NewLocalizedErrorWrapper(err, "error.invalid_site_url", err)
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}
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if !youtubeHostRegex.MatchString(decodedUrl.Host) {
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slog.Debug("This website is not a YouTube page, the regex doesn't match", slog.String("website_url", websiteURL))
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err = errNotYoutubeUrl
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return
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return nil, nil
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}
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switch {
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case strings.HasPrefix(decodedUrl.Path, "/channel"):
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idKind = youtubeIDKindChannel
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matches := youtubeChannelRegex.FindStringSubmatch(decodedUrl.Path)
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id = matches[1]
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return
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case strings.HasPrefix(decodedUrl.Path, "/watch") && decodedUrl.Query().Has("list"):
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idKind = youtubeIDKindPlaylist
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id = decodedUrl.Query().Get("list")
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return
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case strings.HasPrefix(decodedUrl.Path, "/playlist"):
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idKind = youtubeIDKindPlaylist
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id = decodedUrl.Query().Get("list")
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return
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if (strings.HasPrefix(decodedUrl.Path, "/watch") && decodedUrl.Query().Has("list")) || strings.HasPrefix(decodedUrl.Path, "/playlist") {
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playlistID := decodedUrl.Query().Get("list")
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feedURL := fmt.Sprintf(`https://www.youtube.com/feeds/videos.xml?playlist_id=%s`, playlistID)
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return Subscriptions{NewSubscription(websiteURL, feedURL, parser.FormatAtom)}, nil
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}
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err = fmt.Errorf("finder: unable to extract youtube id from URL: %s", websiteURL)
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return
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return nil, nil
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}
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@ -4,94 +4,184 @@
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package subscription
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import (
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"errors"
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"strings"
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"testing"
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)
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func TestFindYoutubePlaylistFeed(t *testing.T) {
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scenarios := map[string]string{
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"https://www.youtube.com/playlist?list=PLOOwEPgFWm_NHcQd9aCi5JXWASHO_n5uR": "https://www.youtube.com/feeds/videos.xml?playlist_id=PLOOwEPgFWm_NHcQd9aCi5JXWASHO_n5uR",
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"https://www.youtube.com/playlist?list=PLOOwEPgFWm_N42HlCLhqyJ0ZBWr5K1QDM": "https://www.youtube.com/feeds/videos.xml?playlist_id=PLOOwEPgFWm_N42HlCLhqyJ0ZBWr5K1QDM",
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"https://www.youtube.com/watch?v=dQw4w9WgXcQ&list=PLOOwEPgFWm_N42HlCLhqyJ0ZBWr5K1QDM": "https://www.youtube.com/feeds/videos.xml?playlist_id=PLOOwEPgFWm_N42HlCLhqyJ0ZBWr5K1QDM",
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}
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for websiteURL, expectedFeedURL := range scenarios {
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subscriptions, localizedError := NewSubscriptionFinder(nil).FindSubscriptionsFromYouTubePlaylistPage(websiteURL)
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if localizedError != nil {
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t.Fatalf(`Parsing a correctly formatted YouTube playlist page should not return any error: %v`, localizedError)
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}
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if len(subscriptions) != 1 {
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t.Fatal(`Incorrect number of subscriptions returned`)
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}
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if subscriptions[0].URL != expectedFeedURL {
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t.Errorf(`Unexpected Feed, got %s, instead of %s`, subscriptions[0].URL, expectedFeedURL)
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}
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}
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}
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func TestYoutubeIdExtractor(t *testing.T) {
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type testResult struct {
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ID string
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Kind youtubeKind
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error error
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websiteURL string
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feedURL string
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discoveryError bool
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}
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urls := map[string]testResult{
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"https://www.youtube.com/watch?v=dQw4w9WgXcQ&list=PLOOwEPgFWm_N42HlCLhqyJ0ZBWr5K1QDM": {
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ID: "PLOOwEPgFWm_N42HlCLhqyJ0ZBWr5K1QDM",
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Kind: youtubeIDKindPlaylist,
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error: nil,
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scenarios := []testResult{
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// Video URL
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{
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websiteURL: "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
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feedURL: "",
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},
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"https://www.youtube.com/playlist?list=PLOOwEPgFWm_NHcQd9aCi5JXWASHO_n5uR": {
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ID: "PLOOwEPgFWm_NHcQd9aCi5JXWASHO_n5uR",
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Kind: youtubeIDKindPlaylist,
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error: nil,
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// Video URL with position argument
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{
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websiteURL: "https://www.youtube.com/watch?v=dQw4w9WgXcQ&t=1",
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feedURL: "",
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},
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"https://www.youtube.com/channel/UC-Qj80avWItNRjkZ41rzHyw": {
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ID: "UC-Qj80avWItNRjkZ41rzHyw",
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Kind: youtubeIDKindChannel,
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error: nil,
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// Video URL with position argument
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{
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websiteURL: "https://www.youtube.com/watch?t=1&v=dQw4w9WgXcQ",
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feedURL: "",
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},
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"https://www.example.com/channel/UC-Qj80avWItNRjkZ41rzHyw": {
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ID: "",
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Kind: "",
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error: errNotYoutubeUrl,
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// Channel URL
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{
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websiteURL: "https://www.youtube.com/channel/UC-Qj80avWItNRjkZ41rzHyw",
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feedURL: "",
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},
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// Channel URL with name
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{
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websiteURL: "https://www.youtube.com/@ABCDEFG",
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feedURL: "",
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},
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// Playlist URL
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{
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websiteURL: "https://www.youtube.com/playlist?list=PLOOwEPgFWm_NHcQd9aCi5JXWASHO_n5uR",
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feedURL: "https://www.youtube.com/feeds/videos.xml?playlist_id=PLOOwEPgFWm_NHcQd9aCi5JXWASHO_n5uR",
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},
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// Playlist URL with video ID
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{
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websiteURL: "https://www.youtube.com/watch?v=dQw4w9WgXcQ&list=PLOOwEPgFWm_N42HlCLhqyJ0ZBWr5K1QDM",
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feedURL: "https://www.youtube.com/feeds/videos.xml?playlist_id=PLOOwEPgFWm_N42HlCLhqyJ0ZBWr5K1QDM",
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},
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// Playlist URL with video ID and index argument
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{
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websiteURL: "https://www.youtube.com/watch?v=6IutBmRJNLk&list=PLOOwEPgFWm_NHcQd9aCi5JXWASHO_n5uR&index=4",
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feedURL: "https://www.youtube.com/feeds/videos.xml?playlist_id=PLOOwEPgFWm_NHcQd9aCi5JXWASHO_n5uR",
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},
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// Non-Youtube URL
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{
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websiteURL: "https://www.example.com/channel/UC-Qj80avWItNRjkZ41rzHyw",
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feedURL: "",
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},
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// Invalid URL
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{
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websiteURL: "https://example|org/",
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feedURL: "",
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discoveryError: true,
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},
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}
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for websiteURL, expected := range urls {
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kind, id, err := youtubeURLIDExtractor(websiteURL)
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if !errors.Is(err, expected.error) {
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t.Fatalf(`Unexpected error: %v got %v`, expected.error, err)
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for _, scenario := range scenarios {
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subscriptions, localizedError := NewSubscriptionFinder(nil).FindSubscriptionsFromYouTubePlaylistPage(scenario.websiteURL)
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if scenario.discoveryError {
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if localizedError == nil {
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t.Fatalf(`Parsing an invalid URL should return an error`)
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}
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}
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if id != expected.ID {
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t.Fatalf(`Unexpected ID: %v got %v`, expected.ID, id)
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}
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if kind != expected.Kind {
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t.Fatalf(`Unexpected Kind: %v got %v`, expected.Kind, kind)
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if scenario.feedURL == "" {
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if len(subscriptions) > 0 {
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t.Fatalf(`Parsing a non-playlist URL should not return any subscription: %q`, scenario.websiteURL)
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}
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} else {
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if localizedError != nil {
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t.Fatalf(`Parsing a correctly formatted YouTube playlist page should not return any error: %v`, localizedError)
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}
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if len(subscriptions) != 1 {
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t.Fatalf(`Incorrect number of subscriptions returned`)
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}
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if subscriptions[0].URL != scenario.feedURL {
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t.Errorf(`Unexpected Feed, got %s, instead of %s`, subscriptions[0].URL, scenario.feedURL)
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}
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}
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}
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}
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func TestFindYoutubeChannelFeed(t *testing.T) {
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scenarios := map[string]string{
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"https://www.youtube.com/channel/UC-Qj80avWItNRjkZ41rzHyw": "https://www.youtube.com/feeds/videos.xml?channel_id=UC-Qj80avWItNRjkZ41rzHyw",
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type testResult struct {
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websiteURL string
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feedURL string
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discoveryError bool
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}
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for websiteURL, expectedFeedURL := range scenarios {
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subscriptions, localizedError := NewSubscriptionFinder(nil).FindSubscriptionsFromYouTubeChannelPage(websiteURL)
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if localizedError != nil {
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t.Fatalf(`Parsing a correctly formatted YouTube channel page should not return any error: %v`, localizedError)
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scenarios := []testResult{
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// Video URL
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{
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websiteURL: "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
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feedURL: "",
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},
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// Video URL with position argument
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{
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websiteURL: "https://www.youtube.com/watch?v=dQw4w9WgXcQ&t=1",
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feedURL: "",
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},
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// Video URL with position argument
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{
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websiteURL: "https://www.youtube.com/watch?t=1&v=dQw4w9WgXcQ",
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feedURL: "",
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},
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// Channel URL
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{
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websiteURL: "https://www.youtube.com/channel/UC-Qj80avWItNRjkZ41rzHyw",
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feedURL: "https://www.youtube.com/feeds/videos.xml?channel_id=UC-Qj80avWItNRjkZ41rzHyw",
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},
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// Channel URL with name
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{
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websiteURL: "https://www.youtube.com/@ABCDEFG",
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feedURL: "",
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},
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// Playlist URL
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{
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websiteURL: "https://www.youtube.com/playlist?list=PLOOwEPgFWm_NHcQd9aCi5JXWASHO_n5uR",
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feedURL: "",
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},
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// Playlist URL with video ID
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{
|
||||
websiteURL: "https://www.youtube.com/watch?v=dQw4w9WgXcQ&list=PLOOwEPgFWm_N42HlCLhqyJ0ZBWr5K1QDM",
|
||||
feedURL: "",
|
||||
},
|
||||
// Playlist URL with video ID and index argument
|
||||
{
|
||||
websiteURL: "https://www.youtube.com/watch?v=6IutBmRJNLk&list=PLOOwEPgFWm_NHcQd9aCi5JXWASHO_n5uR&index=4",
|
||||
feedURL: "",
|
||||
},
|
||||
// Non-Youtube URL
|
||||
{
|
||||
websiteURL: "https://www.example.com/channel/UC-Qj80avWItNRjkZ41rzHyw",
|
||||
feedURL: "",
|
||||
},
|
||||
// Invalid URL
|
||||
{
|
||||
websiteURL: "https://example|org/",
|
||||
feedURL: "",
|
||||
discoveryError: true,
|
||||
},
|
||||
}
|
||||
|
||||
for _, scenario := range scenarios {
|
||||
subscriptions, localizedError := NewSubscriptionFinder(nil).FindSubscriptionsFromYouTubeChannelPage(scenario.websiteURL)
|
||||
if scenario.discoveryError {
|
||||
if localizedError == nil {
|
||||
t.Fatalf(`Parsing an invalid URL should return an error`)
|
||||
}
|
||||
}
|
||||
|
||||
if len(subscriptions) != 1 {
|
||||
t.Fatal(`Incorrect number of subscriptions returned`)
|
||||
}
|
||||
if scenario.feedURL == "" {
|
||||
if len(subscriptions) > 0 {
|
||||
t.Fatalf(`Parsing a non-channel URL should not return any subscription: %q`, scenario.websiteURL)
|
||||
}
|
||||
} else {
|
||||
if localizedError != nil {
|
||||
t.Fatalf(`Parsing a correctly formatted YouTube channel page should not return any error: %v`, localizedError)
|
||||
}
|
||||
|
||||
if subscriptions[0].URL != expectedFeedURL {
|
||||
t.Errorf(`Unexpected Feed, got %s, instead of %s`, subscriptions[0].URL, expectedFeedURL)
|
||||
if len(subscriptions) != 1 {
|
||||
t.Fatalf(`Incorrect number of subscriptions returned`)
|
||||
}
|
||||
|
||||
if subscriptions[0].URL != scenario.feedURL {
|
||||
t.Errorf(`Unexpected Feed, got %s, instead of %s`, subscriptions[0].URL, scenario.feedURL)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue